Of harrogate



ihvrren" STATES sAMsON rox, OF HARROGATE, COUNTY or YORK, ENGLANDTCORRU'GATED FURNACE OR FL-UE.

SPECIFICATION forming part of Letters Patent No. 414,767, dated November12, l1889.

Application filed January 25, 1888. Serial No. 261,920. `(No model.) I

To ,ZZ-wLOm-it may Concern:

Be it known thatI, SAMSON FOX, a subject of the Queen of Great Britainand Ireland, residing at Harrogate, in the county of York, Kingdom ofGreat Britain and Ireland, have invented' new and useful Improvementsinth-e Manufacture of Corrugated Boiler Furnaces and Flues, of which thefollowing is a specification. A

My invention consists in the manufacture of boiler-f urn acesorfire-boxes and flues, with corrugations of peculiar form, ashereinafter described, whereby such articles are enabled to resistcompression to a greater extent than corrugated furnaces or fire-boxesand fines as heretofore proposed to be made; and for this purpose myinvention consists, essentially, in affording the additional resistanceto collapsing strain without increasing the depth of the corrugations bymaking the corrugations thicker er deeper at their inner and outerridges than at those parts which connect the inner and outer rid'ges,the mode of manufacture being such that the thickness or depth at theinner and outer ridges shall be equal, or thereabout, to the thicknessof the plate preparatory to corrugating, the parts connecting the saidinner and outer ridges beingl drawn thinner by the process ofcorrugating.

Referring to the accompanying drawings, Figure 1 shows in centrallongitudinal section a boiler-ue according to my present invention. Fig.2 shows to a larger scale a section of corrugated plate such as abovereferred to.A Fig. 3 shows a modified form of the corrugations.' Fig. 4shows longitudinal sections of rolls that may be employed to producecorrugations according to my present. invention.

Whenr a tube has been welded, it is heated and then placed in acorrugating-machine and corrugated by rolls; but in some cases it may bemore convenient to produce corrugations such as described by other meansthan a rolling-machine, and such as referred to in the specification ofBritish Letters Patent granted to me, No. 1,097,'dated March 10,

r- 187 7--viz, by swages-such as shown in Figs.

7 and 8 of said specification, but corrugating by the rolling-machine inaccordance with my United States Patent No. 225,586, dated March 16,1,880, I believe to be the most convenient way of producing the,corrugations where practicable.

A B C are corrugations comprising outer ridges d, inner ridges b,andthinner connecting parts c. ample illustrated constitute outer and innerribs -or beads; but the format-ion may be modified by making the parts aand b'offa forni gradually diminishing in thickness to that of .the.connecting `part c, as shown in Fig.' In t-he manufacture of such acorrugated flue I take a plate of metal of suitablethickness, according`to the pressure the intended flue is designed to resist,

The thickness of plate I employ for a due to resist a given pressure isaccording to my present invention greater than the thickness heretoforeemployed in the manufacture of iiues with Ordinary corrugations designedto resist. the same pressure. For example, heretofore in making acorrugated flue of adiameter of three feet six inches, to resist apressure of about one hundred and forty to one hundred and fifty poundsper square inch, it has been usual to employ a plate of metalsuch asmild steel-having a thickness of half an inch; but in carrying outmypresent rlhe'ridg'es av and hin the exinvention I may with advantageuse a plate haying a thickness of three-quarters or an 8o inch, or suchas will coincide with the general scantling of the boiler towhich suchfurnace or fiue tube is to be attached. lVhen a round flue is to'beproduced-such as illustrated, by way of example, in the drawingsthe saidplate is bent to the tubular form and the joint is welded; but, as willbe evident, my present invention so far as relates to the peculiarformation of the corrugations may be applied in boiler tire-boxes,furnaces, and fines of various forms, including such as described in thespecification of another applica-A tion by me for Letters Patent of theUnited States, bearing even date herewith,- Serial No. No. 261,919. Toproceed with the description A A', and the guide-rolls, marked O O',respectively, in the drawings annexed to the specification of my saidUnited States Patent No. 225,586, March 16, 18SO,Will require to beremoved from the machine and other main rolls substituted therefor ofthe form shown at A2 A3, Fig. 4, having suitable grooves a4, for formingthe ridges d Z7 on the external and internal corrugations of a tubeunder treatment, and guide-rolls O2 O3, Fig. 5, having suitable groovesO4 for the reception of the ridges c as they are being formed, and whenthe section of the corrugations are required, as shown in' Fig. 3, thegrooves inthe rolls are made to suit such form.

It will be understood that according to my present invention there areproduced at the outer and inner ridges, beads, or additional ridges orparts a and b, respectively, ot' a thickness equal, or nearly so, tothat of the plain plate or flue previous to corrugation, the remainingparts c of'the corrugations being drawn thinner by the process ofcorrugating.

What I clairn as my invention is 1. In a steam-boiler furnace, fire-box,or Hue corrugation's, each of which is thicker at the ridge than at thesides or parts that connect one ridge with another, substantially asdescribed.

2. In asteanl-boiler furnace, fire-box, or iiue, corrugations comprisingouter and inner ridges a and b, and connecting parts c, said ridgesbeing thicker t-han said connecting parts, substantially as described.

3. In a steam-boiler furnace, tire-box, or Hue, corrugations comprisingouter and inner ridges a, and b, and connecting parts c, said ridgesbeing made in the form of beads or ribs of greater depth than saidconnecting parts c, substantially as described.

4. In a steam-boiler furnace, fire-box, or fine, corrugations comprisingouter and inner ridges c and b, of a depth or thickness about equal tothat of the plate previous to corrugation, and connecting parts c, drawnthinner in the process of corrugating, substantially as described.

5. The herein-described process of making steam-boiler furnace,fire-box, or flue, consisting in first bending a plate of metal totheform cfa tube, then Welding the joint, then forming around said weldedtube corrugations comprising outerandl inner ridges a and l), withconnecting parts c, said connecting parts being drawn out or reduced inthickness by the act' of corrugation until they are thinner than theridges, substantially as described.

Leeds, October 3, 1887. SAMSON FOX.

In presence of- THos. E. CRAVEN, WM. SADLER,

Both of Leeds.

